| 摘要 |
<p>PURPOSE:To provide a hydraulic circuit for a mold mounting/demounting device having the unclamping force larger than the clamping force. CONSTITUTION:In a hydraulic circuit of a mold mounting/demounting device in which pressurizing oil is fed to both sides of a piston 52 in a hydraulic cylinder device 50 by a selector valve 16 at the time of clamping while the pressurizing oil is fed only on the front side of the piston 52 in the hydraulic cylinder device 50 at the time of unclamping to discharge the oil at the rear side of the piston out of the hydraulic cylinder device 50, two pressure reducing valves consisting of a primary pressure reducing valve 22 installed on the hydraulic pump side and a secondary pressure reducing valve 24, the pressure of which is set lower than that of the first pressure reducing valve, are set on a feeding line 12 of the pressurizing oil in series. A selector valve 16 is installed between the hydraulic cylinder device 50 and the secondary pressure reducing valve 24, and the oil at the rear side of the piston 52 is discharged out of the hydraulic cylinder device 50 at the time reducing valve 24 is communicated with atmosphere.</p> |
